/**
 * 
 *Copyright 2014 The Darks Codec Project (Liu lihua)
 *
 *Licensed under the Apache License, Version 2.0 (the "License");
 *you may not use this file except in compliance with the License.
 *You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *Unless required by applicable law or agreed to in writing, software
 *distributed under the License is distributed on an "AS IS" BASIS,
 *WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *See the License for the specific language governing permissions and
 *limitations under the License.
 */

package darks.codec.wrap.cipher;

import darks.codec.CodecParameter;

/**
 * Customize cipher interface.
 * 
 * OCCipher.java
 * 
 * @version 1.0.0
 * @author Liu lihua
 */
public abstract class OCCipher
{

    /**
     * Encrypt bytes data.
     * 
     * @param data Bytes data.
     * @param offset Bytes offset.
     * @param length Bytes length.
     * @param param Codec parameters.
     * @return Bytes after encrypt.
     */
    public abstract byte[] encrypt(byte[] data, int offset, int length,
            CodecParameter param);

    /**
     * Decrypt bytes data.
     * 
     * @param data Bytes data.
     * @param offset Bytes offset.
     * @param length Bytes length.
     * @param param Codec parameters.
     * @return Bytes after decrypted.
     */
    public abstract byte[] decrypt(byte[] data, int offset, int length,
            CodecParameter param);
}
